Charles c



May 26, 1931.

C. C. HANSEN STEEL RETAINER Filed Sept. 30, 1927 z X I25 a4.

IYVVENTOR.

HIS ATTO NEY (Zn vies aasqa Patented May 26, r 1931 UNITED STATES PATENTOFFICE CHARLES C. HANSEN, F ELASTON, PENNSYLVANIA, ASSIGNOR T0INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OFNEW JERSEY STEEL RETAINER Application filed September 30, 1927. SerialNo. 223,040.

This invention relates to pneumatic tools, but more particularly to asteel retainer for that type of tool known as a coal pick.

It is an object of this invention to provide a very simple and efiicientdevice to retain the invention, a

Figure 2 is aside view of a coal pick, part of which is a section takenon the line 2-2 of Figure 1 looking in the direction indicated by thearrows,

Figure 3 is a view of the left side of part of Figure 2, and

Figure 4 is a View of the right side of part ofFigure 2.

Referring more particularly to the drawings, A represents the front partof the cylinder of a pneumatic tool inwhich is mounted a reciprocatoryhammer piston B. The front end of the cylinder A is closed by a frontcylinder washer C through which passes an anvil block D used to transmitthe blows of the piston B to a tool or working implement E. A front headF is secured to the cylinder A by means of side bolts G- passing throughlugs H and secured at the rear end of the cylinder by nuts (not shown).Between the heads J of the side bolts G and the lugs H are interposedsprings K.

The fronthead F is so formed that the shank L of the workin implement Emay be inserted and the collar accommodated by the enlarged longitudinalbore P. An enlargement Q, on the front part of the front head permitsthe forming of a transverse bore R which communicates at a point intermediate its ends with the longitudinal bore P and has substantial sidewalls S. The bore R is reduced at one end as shown at R and in thisreduced portion a slot V, of which the bottom forms a continuation ofthe transverse bore R, is formed.

During the operation of tools of this type, it is necessary to preventthe ejection of the working implement from the front head. To this end apin T is made as follows: A cylindrical shank or middle portion U isprovided at one end of which is a stem W. On the stem W is formed a hookK. On the oppcsite end of the middle portion U is a collar Y and ahandle Z of considerable weight.

The retainer operates in the following manner: The working implement Eis first inserted into the front head F. The'pin T is then placed in thebore R in such a way that the hook X passes through the slot V. Theweight of the handle Z is sufficient to turn the hook X out of registrywith theslot V and to prevent the turning of the hook during theoperation ofthe tool. The collar Y and the hook X are constantly in bodycon tact with the sides of the front head, thus eliminating transversemovement of the pin T. As will be readily seen from the drawing, oncethe pin T is in place it is impossible for the collar 0 of the workingimplement to pass it although it is a very simple operation for theworkman to remove the pin when he wishes to change the workingimplement.

. I claim:

1. In a pneumatic tool, the combination of a front head having alongitudinal bore and a transverse bore communicating at a pointintermediate its ends with the longitudinal bore, said transverse borehaving a reduced portion at one end, a collared working implement in thelongitudinal bore, a pin in the transversebore forming an abutment forthe collar of the working implement to maintain the working implement inthe front head, a stem on one end of said pin extending into the reducedportion of the transverse bore, a hook on the stem toengage one side ofthe front head for holding the pin against endwise movement in onedirection, a slot in the wall of the reduced portion of the transversebore to permit the passage of the hook through said bore, the bottom ofthe slot forming a continuation of the transverse bore, and angularlydisposed weighted means on the other end of the pin normally maintainingthe hook in a position remote from the slot, said hook and saidangularly disposed means in body contact with the sides of said fronthead.

2. In a pneumatic tool, the combination of a front head having alongitudinal bore and a transverse bore communicating at a pointintermediate its ends With the longitudinal bore, said transverse borehaving a reduced portion at one end, a Working implement in thelongitudinal bore having a collar, a pin in the transverse bore formingan abutment for the collar to maintain the Working im plement in thefront head, a stem on one end of the pin extending slidably into thereduced portion of the transverse bore, a hook on the free end of thestem to engage one side of the front head for maintaining the pin in thetransverse bore, a slot in one side of the Wall of the reduced portionof the transverse 2O bore to permit the passage of the hook through saidbore, the bottom of the slot forming a continuation of the transversebore and a lever on the pin for manipulating said pin, said lever andsaid hook having body contact with the sides of said front head, saidlever being disposed at an angle With respect to the pin and of suchWeight as to prevent rotation of the pin, thus maintaining the hook outof registry with the slot. In testimony whereof I have signed thisspecification.

CHARLES C. HANSEN.

